Answer :
Answer:
[tex]Na_2(X)[/tex]
Explanation:
Common ionic charge exhibited by Barium is +2.
Compound formed by Barium and polyatomic ion (X) is Ba(X).
Therefore, ionic charge on polyatomic (X) should be -2 in order to Ba(X) to be neutral.
Common ionic charge exhibited by sodium is +1.
If sodium forms salts with (X), Then, two atoms of sodium will be needed in order to make it neutral. in compounds or salts, no. of atoms are represented as subscripts. Therefore, formula of salts betweem sodium and polyatomic ion should be [tex]Na_2X[/tex]